St Peter Chrysologus, circa 380 – 450, was Bishop of Ravenna from about AD 433.
He is a Doctor of the Church.
According to the Wikipedia:
"Peter was born in Imola, where he was ordained a deacon by Cornelius, Bishop of Imola. He was made an archdeacon through the influence of Emperor Valentinian III. Pope Sixtus III appointed Peter to the See of Ravenna in about the year 433, apparently rejecting the candidate elected by the people of the city. The traditional account, as recorded in the Roman Breviary, is that Sixtus had a vision of St. Peter and St. Apollinaris, the first bishops of Rome and Ravenna respectively, who showed Sixtus a young man and said he was the next Bishop of Ravenna. When the group from Ravenna arrived, including Cornelius and his archdeacon Peter from Imola, Sixtus recognized Peter as the young man in his vision and consecrated him as a bishop.
Known as The Doctor of Homilies, Peter was known for his short but inspired talks; he is said to have been afraid of boring his audience. After hearing his first homily as bishop, Empress Galla Placidia is said to have given him the surname Chrysologus, by which he is known. Galla Placidia was to become the patroness of many of Peter's projects. Peter spoke against the Arian and Monophysite teachings, condemning them as heresies, and explained topics such as the Apostles' Creed, John the Baptist, the Blessed Virgin Mary, and the mystery of the Incarnation, in simple and clear language. Peter advocated daily reception of Holy Communion. He urged his listeners to have confidence in the forgiveness offered through Christ.
He was a counsellor of Pope Leo I. The monophysite Eutyches appealed to Peter to intervene with the pope on his behalf after he was denounced at a synod held in Constantinople in 448. The text of Peter's letter in response to Eutyches has been preserved in the Acts of the Council of Chalcedon; in it, Peter admonishes Eutyches to accept the ruling of the synod and to give obedience to the Bishop of Rome as the successor of Saint Peter."